I have a 12v 7Ah small battery. I will go camping and I bought a solar panel to charge it or at least to keep it charged.
The solar panel is: Pm:5W Vmp:18V Imp: 0.278A Voc: 21.90 Isc: 0.30A.
Can I plug it directly to that battery?
Can I plug it directly to a car battery? (it has a lighter plug for that)
Or this is dangerous and I have to buy a charge controller?
or this is not useful because this solar panel would take ages to charge that battery?
Thank you for your help and patience.
Kind regards from Azores.